This translation of the latest edition of the classic natural birth control book is timely for Spanish-speaking Americans who wish either to plan a pregnancy or avoid a pregnancy without using invasive or “unnatural” methods of conception. A popular guide, this book offers information on reproduction, fertility, and natural conception, as well as specific instructions on Natural Family Planning (NFP) and the Fertility Awareness Method (FAM), with a fair-minded list of advantages and disadvantages to both techniques. Included in this edition are new methods of natural birth control, and an updated bibliography and resource sections, as well as extensive illustrations and 40 charts that help the reader actively use the planning methods described.